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In page Skagit River:

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Settlement along the river by European Americans in the late 1800s was inhibited by two ancient logjams that blocked navigation upriver. The settlers first established a village at the tip of the delta which they called Skagit City. The massive logjam was found about 10 miles (16 km) upstream from the mouth of the river. Attempts to remove it began in 1874 by a team of loggers, who salvaged the logs. After three years of work, a 5-acre (20,000 m2) section of the jam broke free and scattered downriver. Soon thereafter the river became navigable. Mount Vernon was founded at the approximate site of this logjam.[3]